Properties of the Number 18693

Eighteen Thousand Six Hundred Ninety-Three

Basics

Value: 18692 → 18693 → 18694

Parity: odd

Prime: No

Previous Prime: 18691

Next Prime: 18701

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 31 × 67

Divisors: 1, 3, 9, 31, 67, 93, 201, 279, 603, 2077

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100100100000101

Octal: 44405

Duodecimal: A999

Hexadecimal: 4905

Square: 349428249

Square Root: 136.72234638127009

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Odd numbers m for which A379113(m²) > 1, i.e., k = m² has a proper unitary divisor d > 1 such that A048720(A065621(σ(d)),σ(k/d)) is equal to σ(k). A379122

Numbers k such that k - A067666(k) is a square. A386304

Numbers n such that 5·10ⁿ + 8·R_n - 7 is prime, where R_n = 11...1 is the repunit (A002275) of length n. A103022

a(n) = ∑_k=0..n 2^n-k * binomial(5·n,k). A386699

Divisors of 870. A18693